*{
  padding: 0;
  margin: 0;
  list-style: none;
}
.box1{
  width: 100vw;
  height: 5vh;
  background: #ccc;
}
.rm{
  
  ul{
    display: flex;
  flex-wrap: wrap;
    height: 100px;
    li{
      margin-top: 5px;
      width: 20%;
      height: 30px;
      background: #ccc;
      margin-left: 10px;
      border-radius: 3px;
      text-align: center;
      line-height: 30px;
    }
  }
}